There is no single, universally agreed-upon list of exactly seven vital signs. Medicine traditionally recognizes four: body temperature, heart rate (pulse), blood pressure, and respiratory rate. Over time, oxygen saturation and pain level have been widely adopted as the fifth and sixth. The seventh varies depending on the source, with some clinicians counting smoking status and others pointing to newer candidates like walking speed. Here’s what each one measures, what the normal ranges look like, and why they matter.
The Four Traditional Vital Signs
These are the measurements taken at virtually every medical visit, emergency room check-in, and hospital stay. Together they give a quick snapshot of how your heart, lungs, and basic metabolic functions are performing.
Body Temperature
Normal body temperature is generally accepted as 98.6°F (37°C), but healthy readings can range from 97°F to 99°F (36.1°C to 37.2°C) depending on the time of day, your activity level, and where the measurement is taken. A reading above 100.4°F (38°C) typically indicates a fever, usually caused by infection or illness. Temperature can be measured orally, under the arm, in the ear, or on the forehead. Oral readings tend to be the most reliable for everyday use.
Heart Rate (Pulse)
Your resting heart rate reflects how many times your heart beats per minute when you’re sitting or lying still. For adolescents and adults, the normal range is 60 to 100 beats per minute. Children run faster: toddlers average 80 to 130, and infants can be as high as 80 to 140. Well-trained athletes often have resting rates in the 40s or 50s because their hearts pump more blood per beat. A pulse that’s consistently too fast, too slow, or irregular can signal problems ranging from dehydration and anxiety to heart rhythm disorders.
Blood Pressure
Blood pressure is recorded as two numbers. The top number (systolic) measures pressure when your heart contracts; the bottom number (diastolic) measures pressure between beats. According to the 2025 ACC/AHA guidelines, the categories for adults are:
- Normal: below 120/80 mm Hg
- Elevated: 120 to 129 systolic with diastolic still below 80
- Hypertension Stage 1: 130 to 139 systolic or 80 to 89 diastolic
- Hypertension Stage 2: 140 or higher systolic, or 90 or higher diastolic
These categories are based on averaged readings taken in a healthcare setting. A single high reading doesn’t necessarily mean you have hypertension, which is why providers usually want multiple measurements over time before making that call.
Respiratory Rate
This is simply how many breaths you take per minute while at rest. The normal adult range is 12 to 18 breaths per minute. Children breathe faster, with newborns taking 30 to 60 breaths per minute. A rate that’s consistently elevated at rest can point to conditions like pneumonia, asthma flare-ups, heart failure, or even severe anxiety. Because people tend to change their breathing pattern when they know it’s being counted, clinicians often measure respiratory rate while appearing to check your pulse.
Oxygen Saturation: The Fifth Vital Sign
Oxygen saturation (SpO2) measures the percentage of hemoglobin in your blood that’s carrying oxygen. It’s checked with a pulse oximeter, the small clip-on device placed on your fingertip. Healthy values range from 95% to 100%. Readings below 90% are considered low and suggest your body isn’t getting enough oxygen, a condition called hypoxemia. This measurement became especially prominent during the COVID-19 pandemic, when many people bought home pulse oximeters to monitor their lungs.
Of all the additions to the traditional four, pulse oximetry has the strongest evidence for improving patient outcomes. It can reveal respiratory problems that aren’t yet obvious from the other vital signs alone, catching issues like silent drops in oxygen levels before symptoms like confusion or bluish skin appear.
Pain Level: The Sixth Vital Sign
Pain was formally promoted as “the fifth vital sign” in the late 1990s by several U.S. healthcare systems, with the goal of making sure providers took pain seriously and treated it promptly. The most common tool is the 0-to-10 numeric scale, where 0 means no pain and 10 is the worst pain imaginable. For children or people who have difficulty with numbers, the Faces Pain Scale uses illustrations of expressions ranging from comfortable to agonized.
More detailed tools exist for tracking pain over time. The PEG scale, for instance, asks three questions: how bad your pain has been in the past week, how much it has interfered with your enjoyment of life, and how much it has limited your general activity, each scored 0 to 10. This gives a fuller picture than a single number.
The “pain as a vital sign” approach has become controversial. Many experts now argue that the push to aggressively treat every reported pain score contributed to overprescription of opioids and the subsequent addiction crisis. As a result, some healthcare systems are moving away from treating pain as a standalone vital sign, though pain assessment itself remains a core part of clinical care.
The Seventh: It Depends Who You Ask
This is where the neat list of seven gets messy, because there’s no consensus on what earns the seventh slot. Two candidates appear most often.
Smoking status is the option with the most institutional backing. Research has found that, alongside pulse oximetry, smoking status is one of only two additions to the traditional four that meaningfully affects patient outcomes. The logic is practical: recording whether someone smokes at every visit creates a built-in prompt for providers to offer cessation counseling. It’s less of a physiological measurement and more of a behavioral screen, which is why some clinicians resist calling it a true vital sign.
Walking speed (gait speed) is gaining traction, particularly in geriatric and rehabilitation medicine. How fast someone walks turns out to be a surprisingly powerful predictor of overall health, fall risk, hospitalization rates, and even long-term survival in older adults. It’s simple to measure (time someone walking a set distance) and captures information about muscle strength, balance, cardiovascular fitness, and neurological function all at once. Some physical therapists and geriatricians already treat it as a routine vital sign.
Other measures occasionally proposed for vital-sign status include blood glucose level, body mass index, and level of consciousness. None of these have achieved the same level of adoption as the six listed above, and the seventh position remains genuinely unsettled in clinical practice.
Why Vital Signs Matter Beyond the Clinic
Vital signs are valuable precisely because they’re fast, cheap, and repeatable. A single set of readings gives clinicians a baseline. Repeated sets reveal trends, and trends are often more informative than any individual number. A blood pressure of 135/85 means one thing in isolation and something very different if it was 110/70 two hours ago.
In hospitals, changes in vital signs feed into early warning scores that help nurses identify patients who are deteriorating before a full-blown emergency develops. A creeping rise in heart rate combined with a dip in oxygen saturation and a climbing respiratory rate, for example, can trigger a rapid-response team well before the patient looks visibly sick.
At home, you can track several of these yourself. Digital thermometers, automatic blood pressure cuffs, pulse oximeters, and smartwatches that measure heart rate are all widely available. Knowing your personal baselines makes it easier to spot when something shifts, and gives you concrete numbers to share with your provider instead of vague descriptions like “I felt off.”